package com.itheima.reggie.filter;
import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
 *
 * 检查用户是否已经完成登录
 *
 */
@WebFilter(urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest,
                         ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException,
            ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次请求的uri
        String requestURI = request.getRequestURI();

        log.info("拦截到请求:{}",requestURI);

        //(1)定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login"

        };
        //1.获取本次请求是否需要处理
        String requestURI1 = request.getRequestURI();

        //2.判断本次请求是否需要处理
         boolean check = check(urls,requestURI);
        //3.如果不需要处理,则直接放行
        if (check){

            log.info("本次请求不需要处理",requestURI);
           filterChain.doFilter(request,response);
            return;
        }
        //4.判断登录状态,如果已经登录,则放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录,用户id为:{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }
        //增强移动端登录,如果已登录,就直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录,用户id为:{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }


        log.info("用户未登录");
        //5.如果未登录则返回登录结果
         response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
            return;
    }

    /**
     * 路径匹配,检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
